- Same problem as Present Perfect.
- Not commonly used in some languages thus making it difficult to use in English; however, this is "a must learn" grammar.
- Two events.
- Both happen in the past.
- On event happens before the other
- had + past participle of verb
- I had been been in Rio just one day when I got robbed.
- I had worked in Paris for a year, before I moved to California.
- When you met your future wife, how long had you been in Bogota?
- She had worked at the hospital for over 15 years so she was shocked when she learned she had been laid off.
- The stock market had been opened an hour, when the sell-off began.
- I had worked in Saudi Arabia for year, when I took my first vacation.
NOTE: Other tenses